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Be careful, as the vast majority of those phonographs had hot chassis. There is no power transformer and thus no isolation from the power line. They take certain precautions but still it's possible to get some current through your body. You probably have a 50A5 output tube, a 50Y5 (?) rectifier and, in some units, a 14A6 or something as a driver. Many didn't even bother with a driver and depended on a high output cartridge to drive the output tube.
I may even have a Sams on that model; I have a few books of old stuff. As for speed, the 33-1/3 speed was used by radio stations to get longer play but there were no commercially available records at that speed until after WW II, and when they did become available they had narrower grooves, necessitating smaller styli.
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